Internal cutter for ABS?

Helping a friend finish out a bathroom, new construction roughed in long ago
and then left alone. There is a rough toilet drain stub sticking up out of
the concrete floor, still capped with the test plug. This is a 3" ABS pipe
that was wrapped with sill sealer (foam sheet) before the slab was poured,
so there is about 1/2" clearance for the o.d. of a flange to be installed
around the pipe. A ceramic tile floor is set up to the edge of the foam.
I have been told that there is a tool called an internal pipe cutter that
will cut off the ABS clean at the right depth below the tile to install a
standard toilet flange. No luck finding such a tool at the local hardware
or my familiar industrial suppliers MSC, McMaster, Grainger... nobody knows
what I am talking about.
If someone can describe the tool for this and/or how this is ordinarily
done, I'll be eternally grateful. thanks
Bob

You need a 3" cutting wheel for a grinder.
Look for it in the grinder wheel section.
The small one is not as common but its perfect.
It just fits inside 3" so it makes it easier to make an even cut.
This goes on your cordless drill with a mandrell.
bring a little piece of 3" pipe or a tape measure with you to confirm size.
Works great!
much better than cheesy dremmel tool or other small wheels.

Go to Fergusons on one of your local plumbing supply houses. A regular
hardware store won't carry this item. It's a fairly simple design.
It's basically a drill bit with a small (about 1" diameter) blade on
the end. You put this thing on your drill and you can easily cut the
pipe from the inside. Make sure you take good measurements before you
go hacking away though. You only get one chance at this before you
have to break concrete.

"Mark Monson"
It'll work with the right kind of collar. There's a make that you can
slide over a 3" pipe like a tuba that would allow for a good fit even if the
pipe terminates flush with the floor.
The internal cutter I've use before fits inside the pipe and expands as
you ratchet it with a cutting wheel on one side and a roller on the other.

Doesn't matter what kind of flange you use. If you don't cut the 3" pipe off
below
floor level it will interfere with the bowl horn on many W.C.'s. The way to go
is
use a 4x3 closet bend, whack the 4" pipe off flush with the floor, and then use a
4x3 flush fit flange.
MM

ok lets start over. sawzall with a long blade cut 3'' pipe FLUSH with
floor ,tile ,vinyl whatever then pull out foam crap. then go somewhere
you have never been before ( like a plumbing supply house) and ask for a
abs toilet flange that will glue over 3" abs. you will make many new
friends there and they will ask you to even come back. don't forget wax
ring.bolts. supply tube while your there.

no i have seen it in some modular homes,and also at the yard of a couple
supply houses.just pvc and cast iron for me for waste, pex and copper
for water.i think that 90 that comes with g/d might be abs.why is abs
out in the market?

"Mark Monson"
What you describe is a normal way I do it, but I've not had a problem
running 3" flush with the floor. If what you say it true, then the bowl
horn would have to hit the floor before the rim of the bowl. Are there
toilets that are like that these days? With a sawsall, you can actually cut
the pipe about 3/16ths below the floor if you cut at the right angle.
The only trouble I've run into is using wax rings with those plastic
horns. Only rarely though.

My way is still the best. The bits they talk about are a rip off.
They serve only one pourpos and you need a bit for every size pipe on the
other flavor.
(there a couple of diff. styles)
I am a real plumber unlike some of these other guys. I have had to do
this a few times.

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